High-efficiency laser fabrication of drag reducing riblet surfaces on pre-heated Teflon

Andrius Zemaitis, Justinas Miksys, Mantas Gaidys, Paulius Gecys, Mindaugas Gedvilas (Corresponding Author)

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    14 Citations (Scopus)

    Abstract

    Bio-inspired surfaces are able to decrease friction with fluids and gases. The most recognizable are shark-skin-like riblet surface structures. Such bio-inspired surfaces can be formed by the laser ablation technique. In this work, bio-inspired riblet surfaces with grooves were formed using picosecond ultraviolet laser ablation on pre-heated polytetrafluoroethylene (PTFE) at various sample temperatures. The ablation of hot PTFE was found to be 30% more efficient than the conventional laser structuring at the room temperature. The friction of structured PTFE surfaces with the flowing air was investigated by using drag a measurement setup. Results show the decrease of friction force by 6% with dimensionless riblet spacing around 14-20.

    Original languageEnglish
    Article number065309
    JournalMaterials Research Express
    Volume6
    Issue number6
    Early online date15 Mar 2019
    DOIs
    Publication statusPublished - 15 Mar 2019

    Keywords

    • PTFE
    • Teflon
    • Direct laser ablation
    • Drag reduction
    • Pre-heated
    • Riblets
    • Shark-skin-like

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